Kiln body structure for contaminated soil thermal desorption remediation

Abstract

This invention discloses a kiln structure for thermal desorption remediation of contaminated soil, belonging to the field of contaminated soil treatment technology. It includes an inner cylinder, with an outer cylinder sleeved around it. Several sets of support components are provided between the inner and outer cylinders to connect them. These support components are evenly distributed along the length of the inner cylinder. Each set of support components includes four support blocks, evenly arranged along the circumference of the inner cylinder. Adjacent sets of support components are staggered by 45°. The arc length of one support block is greater than one-eighth and less than one-quarter of the circumference of the inner surface of the outer cylinder. This technical solution addresses the problem of existing rotary kilns having limited functionality and being inconvenient for thermal desorption of contaminated soil.

Description

Technical Field

[0001] This invention belongs to the field of contaminated soil treatment technology, specifically relating to a kiln structure for thermal desorption remediation of contaminated soil. Background Technology

[0002] Soil thermal desorption is a technology used to remediate soil contaminated with organic pollutants. The core of this technology lies in heating the soil to cause the organic pollutants to volatilize or separate, allowing them to be collected and treated. Thermal desorption technology can be divided into in-situ thermal desorption and ex-situ thermal desorption. In-situ thermal desorption involves heating the soil directly at the contaminated site, while ex-situ thermal desorption involves excavating the contaminated soil and heating it elsewhere.

[0003] In the process of ex-situ thermal desorption, the soil is usually heated by a rotary kiln. However, the use of rotary kilns in the existing technology is relatively limited. They are either used for direct heating (heating the soil by contact between fuel and soil) or for indirect heating (heating the soil with hot air). The direct or indirect heating mode cannot be selected according to the characteristics of the substances to be desorbed from the soil, which brings inconvenience to the thermal desorption of soil. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a kiln structure for thermal desorption remediation of contaminated soil, so as to solve the problem that the rotary kiln in the prior art has a single function and is not convenient for thermal desorption of contaminated soil.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention discloses a kiln structure for thermal desorption remediation of contaminated soil, comprising an inner cylinder and an outer cylinder sleeved on the outside of the inner cylinder. Several sets of support components are provided between the inner and outer cylinders to connect them. These support components are evenly distributed along the length of the inner cylinder. Each set of support components includes four support blocks, which are evenly arranged along the circumference of the inner cylinder. Adjacent sets of support components are staggered by 45° in the circumferential direction. The arc length of one support block is greater than one-eighth and less than one-quarter of the circumference of the inner surface of the outer cylinder.

[0007] Furthermore, the outer cylinder is provided with several tires, the inner ring of which is fixed to the outer surface of the outer cylinder. A support block is provided below the tires, and two sets of drive components are arranged side by side on one support block. One set of drive components includes symmetrically arranged fixed plates. One end of the fixed plate is fixed to the support block, and a support roller is provided between the two fixed plates. A rotating shaft is provided in the middle of the support roller, and the middle of the support roller is fixedly connected to the rotating shaft. The two ends of the rotating shaft are respectively rotatably connected to the other end of the fixed plate. The tires are placed on the support rollers. Both ends of the rotating shaft extend to the outside of the fixed plate. A drive motor is provided on the support block, and the output shaft of the drive motor is connected to the end of the rotating shaft located outside the fixed plate.

[0008] Furthermore, each end face of the support roller is provided with a circular baffle. One side of the circular baffle is fixed to the end face of the support roller, and the support roller is located between the two circular baffles. The circular baffles are in sliding contact with the end face of the support roller. The output shaft of the drive motor is provided with a plurality of circumferentially distributed first blocks, and one end of the rotating shaft connected to the drive motor is provided with a plurality of circumferentially distributed second blocks. The positions of the plurality of first blocks and the plurality of second blocks are arranged in a one-to-one correspondence. A sliding cylinder is sleeved on the outer side of the first blocks and the second blocks. A plurality of limiting blocks are provided on the inner side of the sliding cylinder. The limiting blocks are fixed on the sliding cylinder. The plurality of first blocks and the plurality of second blocks are located within the installation spacing between adjacent limiting blocks.

[0009] Furthermore, a first baffle is provided on the outer side of the sliding cylinder near the circular baffle, and the middle part of the first baffle is fixed on the rotating shaft. A second baffle is provided on the end of the sliding cylinder near the drive motor, and the second baffle is fixed on the sliding cylinder. A third baffle is provided on the output shaft, and the middle part of the third baffle is fixed on the output shaft. A spring is provided between the third baffle and the second baffle. The spring is sleeved on the output shaft, and the two ends of the spring are respectively pressed against the second baffle and the third baffle.

[0010] Furthermore, the circular baffle has several rollers on the side that contacts the end face of the tire, and the rollers are rotatably connected to the circular baffle.

[0011] Furthermore, a cylindrical tube is provided below the sliding cylinder, which is fixed to the support pier. A piston is provided inside the cylindrical tube, and a first push rod and a second push rod are respectively provided at both ends of the piston. A first wedge block and a second wedge block are respectively provided on the first push rod and the second push rod. A first push plate and a second push plate are respectively provided on the sliding cylinders of the two sets of drive components on the same support pier. The first push plate and the second push plate are fixed to the outer surface of the sliding cylinder. The first push plate and the first wedge block are in contact to push the piston toward the second push plate. The second push plate and the second wedge block are in contact to push the piston toward the first push plate. A first air pipe and a second air pipe are respectively provided at both ends of the cylindrical tube. One end of the first air pipe and the second air pipe are connected to the interior of the cylindrical tube. The other ends of the first air pipe and the second air pipe point to the parts of the tire and the two support rollers that are about to rotate and contact.

[0012] Furthermore, a Y-shaped air pipe is provided at the other end of both the first and second air pipes, with the two exhaust ends of the Y-shaped air pipe pointing to the part where the tire and the support roller are about to rotate and contact.

[0013] The beneficial effects of this invention are as follows:

[0014] The kiln structure in the technical solution is a composite kiln structure. Therefore, when treating contaminated soil, either direct or indirect heating can be selected based on the soil's characteristics. When indirectly heating the contaminated soil, hot air is simply introduced at the end of the kiln between the inner and outer cylinders. The air flows through the gaps between several support blocks, heating the inner cylinder and the contaminated soil within it, thus achieving thermal desorption of the soil. When directly heating the contaminated soil, the heating fuel and soil are mixed and added directly from the end of the inner cylinder. The heating fuel mixes with the contaminated soil within the inner cylinder for direct heating, thus achieving thermal desorption of the contaminated soil.

[0015] The support blocks are designed to continuously obstruct the flow of hot air as it enters between the inner and outer cylinders, thus reducing its flow speed. This allows the hot air to remain between the inner and outer cylinders for a longer period, increasing the heat exchange time between the hot air and the inner cylinder. This improves heat utilization efficiency and ensures effective heating of the inner cylinder. Furthermore, the constant impact of the hot air against the support blocks during its flow further contributes to a more uniform distribution of hot air between the inner and outer cylinders.

[0016] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0017] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration:

[0018] Figure 1 This is a three-dimensional schematic diagram of the kiln structure of the present invention;

[0019] Figure 2 This is an exploded view of the kiln structure of the present invention;

[0020] Figure 3 This is a schematic diagram illustrating the configuration of the driving component of the present invention;

[0021] Figure 4 This is a three-dimensional schematic diagram of the internal structure of the driving component of the present invention;

[0022] Figure 5 This is a three-dimensional schematic diagram of the sliding cylinder in the driving component of the present invention;

[0023] Figure 6 A three-dimensional schematic diagram showing the first wedge-shaped opening and the second wedge-shaped block disposed at the drive component of the present invention;

[0024] Figure 7 A three-dimensional schematic diagram from another perspective showing the first wedge-shaped opening and the second wedge block disposed at the drive component of the present invention;

[0025] Figure 8 This is a front view schematic diagram of the first wedge-shaped opening and the second wedge-shaped block provided at the drive component of the present invention.

[0026] The following labels are shown in the attached diagram:

[0027] 1. Inner cylinder; 2. Outer cylinder; 3. Support block; 4. Tire; 5. Support block; 6. Drive motor; 7. Fixing plate; 8. Rotating shaft; 9. Support roller; 10. Circular baffle; 11. Second stop block; 12. Output shaft; 13. First stop block; 14. First baffle; 15. Spring; 16. Third baffle; 17. Sliding cylinder; 18. Limiting block; 19. Second baffle; 20. Cylindrical cylinder; 21. Piston; 22. First push rod; 23. First wedge block; 24. First push plate; 25. First air pipe; 26. Second push rod; 27. Second wedge block; 28. Second push plate; 29. ​​Second air pipe. Detailed Implementation

[0028] like Figures 1-8As shown, the present invention discloses a kiln structure for thermal desorption remediation of contaminated soil, comprising an inner cylinder 1, an outer cylinder 2 sleeved on the outside of the inner cylinder 1, and several sets of support components between the inner cylinder 1 and the outer cylinder 2. These support components connect the inner cylinder 1 and the outer cylinder 2. The sets of support components are evenly distributed along the length of the inner cylinder 1. Each set of support components includes four support blocks 3, which are evenly arranged along the circumference of the inner cylinder 1. Adjacent sets of support components are staggered by 45° in the circumferential direction. One support block 3... The arc length is greater than one-eighth of the circumference of the inner surface of the outer cylinder 2 and less than one-quarter of the circumference of the inner surface of the outer cylinder 2. It should be noted that because there are 8 support blocks 3 in the two adjacent sets of support components, the arc length of each support block 3 is between one-eighth and one-quarter of the circumference of the cross-section of the outer cylinder 2, and the two adjacent sets of support components are staggered by 45°. The staggered setting of 45° can be understood as a 45° rotation setting. The advantage of this is that, when viewed from one end of the outer cylinder 2, the 8 support blocks 3 can be combined to form a closed circle.

[0029] Furthermore, the kiln structure in the above technical solution is a composite kiln structure. Therefore, when treating contaminated soil, the method of direct heating or indirect heating can be selected according to the characteristics of the soil. When indirect heating of contaminated soil is used, hot air only needs to be introduced into the gap between the inner cylinder 1 and the outer cylinder 2 at the end of the kiln body. That is, the air flows in the gap between several support blocks 3, thereby heating the inner cylinder 1 and the contaminated soil inside the inner cylinder 1, thereby achieving thermal desorption treatment of the soil. When direct heating of contaminated soil is used, the heating fuel and soil are mixed and added directly from the end of the inner cylinder 1, thereby heating the fuel and contaminated soil inside the inner cylinder 1 for direct heating, thereby achieving thermal desorption treatment of the contaminated soil.

[0030] It should be noted that the support block 3 is designed so that when hot air is introduced between the inner cylinder 1 and the outer cylinder 2, the flow direction of the hot air is continuously blocked by the support block 3, thereby reducing the flow speed of the hot air. This allows the hot air to stay between the inner cylinder 1 and the outer cylinder 2 for a longer period of time, thus increasing the heat exchange time between the hot air and the inner cylinder 1. This improves the heat utilization efficiency and ensures the heating effect on the inner cylinder 1. At the same time, it is easy to understand that the hot air will continuously collide with the support block 3 during its flow, which will make the distribution of hot air between the inner cylinder 1 and the outer cylinder 2 more uniform.

[0031] It should also be noted that the kiln structure should include other structures, such as heat insulation lining on the inner wall of the outer cylinder 2, which are existing technologies and will not be elaborated on here.

[0032] In one feasible embodiment, the outer cylinder 2 is provided with several tires 4, the inner ring of the tires 4 is fixed to the outer surface of the outer cylinder 2, and a support block 5 is provided below the tires 4. Two sets of drive components are arranged side by side on one support block 5. One set of drive components includes symmetrically arranged fixed plates 7. One end of the fixed plate 7 is fixed to the support block 5. A support roller 9 is provided between the two fixed plates 7. A rotating shaft 8 is provided in the middle of the support roller 9. The middle of the support roller 9 is fixedly connected to the rotating shaft 8. The two ends of the rotating shaft 8 are respectively rotatably connected to the other end of the fixed plate 7. The tires 4 are placed on the support roller 9. Both ends of the rotating shaft 8 extend to the outside of the fixed plate 7. A drive motor 6 is fixedly provided on the support block 5. The output shaft 12 of the drive motor 6 is connected to the end of the rotating shaft 8 located outside the fixed plate 7.

[0033] The drive motor 6 drives the rotating shaft 8 to rotate through the output shaft 12, which in turn drives the support roller 9 to rotate. That is, the rotation of the support roller 9 will drive the belt 4 to rotate under the action of friction, which in turn drives the kiln body structure to rotate, thereby realizing rotary heating.

[0034] In one feasible embodiment, circular baffles 10 are provided on both ends of the support roller 9. One side of the circular baffle 10 is fixed to the end face of the support roller 9, and the support roller 9 is located between the two circular baffles 10. The circular baffles 10 slide in contact with the end face of the support roller 9. The output shaft 12 of the drive motor 6 is provided with a plurality of circumferentially distributed first blocks 13. One end of the rotating shaft 8 connected to the drive motor 6 is provided with a plurality of circumferentially distributed second blocks 11. The positions of the plurality of first blocks 13 and the plurality of second blocks 11 are arranged in a one-to-one correspondence. The one-to-one correspondence means that the number of blocks is the same and the position is the same. A sliding cylinder 17 is sleeved on the outer side of the first blocks 13 and the second blocks 11. A plurality of limiting blocks 18 are provided on the inner side of the sliding cylinder 17. The limiting blocks 18 are fixed on the sliding cylinder 17. The plurality of first blocks 13 and the plurality of second blocks 11 are located within the installation spacing between adjacent limiting blocks 18.

[0035] The working principle of the above technical solution is as follows:

[0036] It should be noted that, due to the thermal expansion and contraction of the kiln body during the rotation of the cold kiln and the hot kiln, the position of the tire 4 will change, and the contact position with the support roller 9 will not be fixed. Over time, grooves will appear in the frequently worn and infrequently worn parts of the tire 4, causing the support roller 9 to malfunction.

[0037] Therefore, by setting a circular baffle 10 to clamp the tire 4, and the rotating shaft 8 is specifically connected to the fixed plate 7 through a rotating bearing, the rotating shaft 8 and the rotating bearing are not fixed together. The outer ring of the rotating bearing is fixed to the fixed plate 7. Therefore, the rotating shaft 8 can rotate and slide on the inner ring of the rotating bearing. Therefore, when the position of the tire 4 changes due to thermal expansion and contraction, it will drive the support roller 9 to move together under the action of the circular baffle 10. Since the output shaft 12 of the drive motor 6 and the end of the rotating shaft 8 transmit power through the sliding cylinder 17, even if the rotating shaft 8 moves to a certain position, it will not cause the output of the drive motor 6 to be interrupted. Since the first stop block 13 and the second stop block 11 are set between the limiting block 18, when the first stop block 13 rotates with the output shaft 12, it will drive the sliding cylinder 17 to rotate, which in turn drives the second stop block 11 to rotate, which in turn drives the support roller 9 to rotate.

[0038] The advantage of this arrangement is that it ensures a constant contact surface between the tire 4 and the support roller 9, i.e., a constant wear surface, thus preventing the formation of grooves on the surface of the support roller 9 due to different wear locations.

[0039] In one feasible embodiment, a first baffle 14 is provided on the outer side of the sliding cylinder 17 near the circular baffle 10, and the middle part of the first baffle 14 is fixed on the rotating shaft 8. A second baffle 19 is provided on the sliding cylinder 17 near the drive motor 6, and the second baffle 19 is fixed on the sliding cylinder 17. A third baffle 16 is provided on the output shaft 12, and the middle part of the third baffle 16 is fixed on the output shaft 12. A spring 15 is provided between the third baffle 16 and the second baffle 19. The spring 15 is sleeved on the output shaft 12, and the two ends of the spring 15 are respectively pressed against the second baffle 19 and the third baffle 16.

[0040] The advantage of spring 15 is that when the support roller 9 moves away from the drive motor 6, the first stop 13 slides between the limiting blocks 18, causing the first stop 13 to partially slide out of the sliding cylinder 17. This reduces the contact area between the first stop 13 and the limiting blocks 18, thus decreasing the load-bearing capacity for force transmission. At this time, spring 15 pushes the sliding cylinder 17 onto the third baffle 16, thereby increasing the contact area between the sliding cylinder 17 and the second stop 11 and improving the force transmission effect. The function of the third baffle 16 is to restrict the movement of the sliding cylinder 17, and the distance between the third baffle 16 and the fixed plate 7 is the sliding stroke of the rotating shaft 8.

[0041] In one feasible embodiment, a plurality of rollers are provided on the side of the circular baffle 10 that contacts the end face of the tire 4. The rollers are rotatably connected to the circular baffle 10. The arrangement of the rollers can reduce friction. The arrangement of the rollers can refer to the arrangement of a planar thrust bearing.

[0042] In one feasible embodiment, a cylindrical tube 20 is provided below the sliding tube 17, and the cylindrical tube 20 is fixed to the support pier 5. A piston 21 is provided inside the cylindrical tube 20, and a first push rod 22 and a second push rod 26 are respectively provided at both ends of the piston 21. A first wedge block 23 and a second wedge block 27 are respectively provided on the first push rod 22 and the second push rod 26. A first push plate 24 and a second push plate 28 are respectively provided on the sliding tubes 17 of the two sets of drive assemblies on the same support pier 5. The first push plate 24 and the second push plate 28 are fixed to the sliding tube. On the outer surface of the cylinder 17, the first push plate 24 and the first wedge block 23 are in contact to push the piston 21 toward the second push plate 28. The second push plate 28 and the second wedge block 27 are in contact to push the piston 21 toward the first push plate 24. The two ends of the cylindrical cylinder 20 are respectively provided with a first air pipe 25 and a second air pipe 29. One end of the first air pipe 25 and the second air pipe 29 are connected to the interior of the cylindrical cylinder 20. The other ends of the first air pipe 25 and the second air pipe 29 point to the parts where the tire 4 and the two support rollers 9 are about to rotate and contact.

[0043] like Figure 8 As shown, since the two sets of drive components are arranged side by side and facing the same direction, the two support rollers 9 rotate in the same direction, for example, clockwise. Therefore, the two sliding cylinders 17 must also rotate clockwise. So how do the two clockwise rotating first push plates 24 and second push plates 28 achieve the reciprocating motion of the piston 21? The specific structure is as follows: the inclined surface of the first wedge block 23 is set such that the upper end of the wedge surface is close to the center line of the sliding cylinder 17. That is, when the first push plate 24 moves from the lower part to the upper part of the inclined surface of the first wedge block 23, it will push the first wedge block 23 outward. This causes the piston 21 to move to the other end. The second wedge block 27 is positioned with its lower end close to the axis of the sliding cylinder 17. When the second support plate moves from the upper part to the lower part of the inclined surface of the second wedge block 27, the second push plate 28 pushes the second wedge block 27 outward, thereby pushing the piston 21 to reset, thus realizing the reciprocating motion of the piston 21. It is easy to understand that the first push plate 24 and the second push plate 28 are preferably staggered by 180°. The advantage of this is that it changes the timing of the piston 21's movement, allowing the piston 21 to reciprocate. Of course, the positions and angles of components such as the first wedge block 23, the second wedge block 27, the first baffle 14, and the second baffle 19 can be set according to the actual situation.

[0044] Simultaneously, the reciprocating piston 21 compresses the internal air, causing the compressed gas to be discharged from the first air pipe 25 or the second air pipe 29. As the piston 21 moves, one air pipe discharges air while the other draws in air. Dust-removing cloths can be installed at the ends of the air pipes to prevent dust from entering. This further cleans the area where the tire belt 4 and the support roller 9 will rotate and contact (e.g.,...). Figure 8The surfaces of the first air pipe 25 and the second air pipe 29 are blown to remove impurities and particles, thus preventing damage to the contact surfaces. The blowing method also cools down the support roller 9.

[0045] In one feasible embodiment, a Y-shaped air pipe is provided at the other end of both the first air pipe 25 and the second air pipe 29. The two exhaust ends of the Y-shaped air pipe point to the part where the tire 4 and the support roller 9 are about to rotate and contact, respectively. The two exhaust ends blow the tire 4 and the support roller 9, thereby improving the blowing effect.

[0046] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A kiln structure for thermal desorption remediation of contaminated soil, characterized in that: The system includes an inner cylinder (1), an outer cylinder (2) sleeved on the outside of the inner cylinder (1), and several sets of support components between the inner cylinder (1) and the outer cylinder (2). The support components are used to connect the inner cylinder (1) and the outer cylinder (2). The several sets of support components are evenly arranged along the length of the inner cylinder (1). Each set of support components includes four support blocks (3). The four support blocks (3) are evenly arranged along the circumference of the inner cylinder (1). Adjacent sets of support components are staggered by 45° in the circumference. The arc length of one support block (3) is greater than one-eighth of the circumference of the inner surface of the outer cylinder (2) and less than one-quarter of the circumference of the inner surface of the outer cylinder (2). The outer cylinder (2) is provided with several tires (4). The inner ring of the tires (4) is fixed to the outer cylinder (2). On the outer surface of the tire (4), a support block (5) is provided below the tire (4). Two sets of drive components are arranged side by side on one support block (5). One set of drive components includes symmetrically arranged fixed plates (7). One end of the fixed plate (7) is fixed to the support block (5). A support roller (9) is provided between the two fixed plates (7). A rotating shaft (8) is provided in the middle of the support roller (9). The middle of the support roller (9) is fixedly connected to the rotating shaft (8). The two ends of the rotating shaft (8) are respectively rotatably connected to the other end of the fixed plate (7). The tire (4) is placed on the support roller (9). Both ends of the rotating shaft (8) extend to the outside of the fixed plate (7). A drive motor (6) is provided on the support block (5). The output shaft (12) of the drive motor (6) is connected to the end of the rotating shaft (8) located outside the fixed plate (7).

2. The kiln structure for thermal desorption remediation of contaminated soil according to claim 1, characterized in that: Both ends of the roller (9) are provided with circular baffles (10). One side of the circular baffle (10) is fixed to the end face of the roller (9), and the roller (9) is located between the two circular baffles (10). The circular baffles (10) slide in contact with the end face of the roller (9). The output shaft (12) of the drive motor (6) is provided with several circumferentially distributed first stops (13). One end of the rotating shaft (8) connected to the drive motor (6) is provided with several circumferentially distributed second stops (13). Two stops (11), a number of first stops (13) and a number of second stops (11) are arranged in a one-to-one correspondence. A sliding cylinder (17) is sleeved on the outer side of the first stops (13) and the second stops (11). A number of limiting blocks (18) are provided on the inner side of the sliding cylinder (17). The limiting blocks (18) are fixed on the sliding cylinder (17). A number of first stops (13) and a number of second stops (11) are located within the installation distance between adjacent limiting blocks (18).

3. The kiln structure for thermal desorption remediation of contaminated soil according to claim 2, characterized in that: The sliding cylinder (17) has a first baffle (14) on the outer side of one end near the circular baffle (10). The middle part of the first baffle (14) is fixed on the rotating shaft (8). The sliding cylinder (17) has a second baffle (19) on one end near the drive motor (6). The second baffle (19) is fixed on the sliding cylinder (17). The output shaft (12) has a third baffle (16). The middle part of the third baffle (16) is fixed on the output shaft (12). A spring (15) is provided between the third baffle (16) and the second baffle (19). The spring (15) is sleeved on the output shaft (12), and the two ends of the spring (15) are respectively pressed against the second baffle (19) and the third baffle (16).

4. The kiln structure for thermal desorption remediation of contaminated soil according to claim 3, characterized in that: The circular baffle (10) has several rollers on the side that contacts the end face of the tire (4), and the rollers are rotatably connected to the circular baffle (10).

5. The kiln structure for thermal desorption remediation of contaminated soil according to claim 3, characterized in that: Below the sliding cylinder (17) is a cylindrical cylinder (20), which is fixed to the support pier (5). Inside the cylindrical cylinder (20) is a piston (21), and at both ends of the piston (21) are a first push rod (22) and a second push rod (26). The first push rod (22) and the second push rod (26) are respectively provided with a first wedge block (23) and a second wedge block (27). The sliding cylinders (17) on the two sets of drive assemblies on the same support pier (5) are respectively provided with a first push plate (24) and a second push plate (28). The first push plate (24) and the second push plate (28) are fixed to the sliding cylinder (17). On the outer surface, the first push plate (24) and the first wedge block (23) are in contact to push the piston (21) toward the second push plate (28). The second push plate (28) and the second wedge block (27) are in contact to push the piston (21) toward the first push plate (24). The two ends of the cylindrical tube (20) are respectively provided with a first air pipe (25) and a second air pipe (29). One end of the first air pipe (25) and the second air pipe (29) are connected to the interior of the cylindrical tube (20). The other ends of the first air pipe (25) and the second air pipe (29) point to the parts where the tire (4) and the two support rollers (9) are about to rotate and contact.

6. The kiln structure for thermal desorption remediation of contaminated soil according to claim 5, characterized in that: The other end of the first air pipe (25) and the second air pipe (29) are both provided with Y-shaped air pipes, and the two exhaust ends of the Y-shaped air pipes point to the parts where the tire (4) and the support roller (9) are about to rotate and contact.

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